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From direct to inverse giant magnetocaloric effect in Co-doped NiMnGa multifunctional alloys
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SYSNO ASEP 0358968 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název From direct to inverse giant magnetocaloric effect in Co-doped NiMnGa multifunctional alloys Tvůrce(i) Fabbrici, S. (IT)
Kamarád, Jiří (FZU-D) RID, ORCID
Arnold, Zdeněk (FZU-D) RID, SAI, ORCID
Casoli, F. (IT)
Paoluzi, A. (IT)
Bolzoni, F. (IT)
Cabassi, R. (IT)
Solzi, C. (IT)
Porcari, G. (IT)
Pernechele, C. (IT)
Albertini, F. (IT)Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 59, č. 1 (2011), s. 412-419Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Ni–Mn–Ga–Co ; ferromagnetic shape memory alloys ; magnetostructural transformations ; magnetic properties ; inverse magnetocaloric effect Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA202/09/0030 GA ČR - Grantová agentura ČR CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000284789200042 DOI 10.1016/j.actamat.2010.09.059 Anotace We report the magnetic and magnetocaloric properties in Co-doped Ni-Mn-Ga Heusler alloys around the Mn-rich composition Ni50Mn30Ga20. The presence of Co affects profoundly the critical temperatures and alters the exchange interactions of martensite and austenite to different extents by varying the composition it is possible to tune the critical temperatures and to induce a paramagnetic gap between the magnetically ordered martensite and magnetic austenite,thus giving rise to a reverse magnetostructural transformation.Contrary to the Co-free alloys,the saturation magnetization moment of austenite is strongly enhanced by Co with respect to the martensitic one:thus the magnetocaloric effect turns from direct into inverse.Remarkable values of the magnetic properties related to the magnetocaloric effect,e.g. the saturation magnetization jump at the transformation(DM) and the field dependence of the transformation temperature(dT/dH)are reported. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
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